package edu;

public class whilexunhuan {
    public static void main(String[] args) {

        char xiaoxie = 'a';
        char daxie = 'A';
        for (int i = 1; i <= 26; i++) {
            System.out.print(xiaoxie);
            System.out.print(daxie);
            System.out.print(" ");
            xiaoxie++;
            daxie++;
        }
    }
}